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Add Documentation to help users use PCI endpoint to create virtual functions using configfs. An endpoint function is designated as a virtual endpoint function device when it is linked to a physical endpoint function device (instead of a endpoint controller). Link: https://lore.kernel.org/r/20210819123343.1951-9-kishon@ti.com Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>